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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by physicsmaths)
Im an intruder just here to help as I sat it last year.

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what did you get? any tips?
2. (Original post by IvoryToast)
They are using the formula, it's just 2000 is year 1 so 2002 is the 3rd year
The forumla to find a term is
ar^n-1

Right?

They use ar^n

I understand that some questions do this, but how would you know the difference

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3. (Original post by Ahsen2015)
what did you get? any tips?
Got 94 or 96 not sure but i dropped marks for using tanx=cosx/sinx in a trig question.

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4. what does tanx= anyone pls
what does tanx= anyone pls
Sinx/cosx

Or

1/cotx

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6. hey if i have the inequality: -1.035^n>= -2.353

I can make both sides positive by multiplying by -1 right?

and then this means i switch the sign around right? because when doing an exam solutions video, the sign doesnt seem to change?
7. (Original post by husband material)
Sinx/cosx

Or

1/cotx

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Cot isn't introduced till c3 right? So just sin x/cos x is enough isn't it
8. (Original post by tw15st3d)
hey if i have the inequality: -1.035^n>= -2.353

I can make both sides positive by multiplying by -1 right?

and then this means i switch the sign around right? because when doing an exam solutions video, the sign doesnt seem to change?
I think you can but that power n worries me.. so don't take my word for it.

What i would say is just lob it into logs and change it at the end

log-1.035 -2.353 = n

EDIT: The above log is impossible due to the minus base. I think you have to multiply by -1.
9. (Original post by husband material)
Sinx/cosx

Or

1/cotx

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Or the square root of sec^2x -1

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10. (Original post by frozo123)
Or the square root of sec^2x -1

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We haven't learnt Cot or Sec yet, only sin cos and tan.
11. (Original post by Columbo97)
We haven't learnt Cot or Sec yet, only sin cos and tan.
What equations in c2 do we need to learn? The SA and Volume ones? may you let me know? Thankyou

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12. (Original post by gdunne42)
Absolutely no reason to lose all marks. They usually start with a show that for 4 or so marks. If you can't do that successfully, you can still get the 8+ marks for differentiating the formula given, solving to find the value of the variable that makes the differentiated equation = 0, differentiating again to prove its a max or min and then substituting it in to find the max/min value of the perimeter/area/volume you have been working on.

You need:
perimeters and areas of rectangles, right and non-right angle triangles, trapezia, circles, semicircles, sectors and composite shapes and
volume of cuboid, cyclinder and prisms.

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:]] Thanks so much!!! So I have to memorize the formula for all of those?
13. (Original post by frozo123)
What equations in c2 do we need to learn? The SA and Volume ones? may you let me know? Thankyou

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Equation OF A CIRCLE
(x-a)^2 + (y-b)^2 = r^2

SINE RULE
SinA/a = SinB/b = SinC/c OR a/SinA = b/SinB...etc

COSINE RULE
a^2 = b^2 + c^2 - 2bcCosA OR CosA = b^2 + c^2 - a^2/2bc

AREA OF A TRIANGLE
1/2abSinC OR 1/2bcSinA OR 1/2acSinB

LOGARITHMS
log n (base a) = x => a^x = n - re arranging the logarithm
log x + log y = log (xy) - multiplication law
log x - log y = log (x/y) - division law
log (x)^k = k log x - powers law

Length of an arc = rx (x being the angle in radians)
Area of a Sector = 1/2 r^2 x
Area of a Segment = 1/2 r^2 (x - Sinx)

TRIGONOMETRIC RULES
tan x = sin x/cos x
cos^2 x = 1 - sin^2 x
sin^2 x = 1 - cos^2 x
14. Has anyone tried the solomon papers??
15. Hey guys, I'm praying applications of differentiation doesn't come up! I don't mind the differentiating bit, but the learning SA/Volume formulas suck.

What list of volume + SA formulas should we know? I'm thinking - cylinders, cones, etc..(some are pretty easy to simply work out eg. sphere & rectangle).
16. (Original post by Ahsen2015)
Has anyone tried the solomon papers??
Yeah, not too bad. I'd recommend going on mathsandphysics's website and trying their gold papers! They're basically real exam questions but they have purposefully picked out harder ones from over the years. If you can do them easily, you're prepared for the exam
17. I know its too late i got only 2 days how am I going to prepare

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Hey guys, I'm praying applications of differentiation doesn't come up! I don't mind the differentiating bit, but the learning SA/Volume formulas suck.

What list of volume + SA formulas should we know? I'm thinking - cylinders, cones, etc..(some are pretty easy to simply work out eg. sphere & rectangle).
These are all of them, only a few should come up.

http://math2.org/math/geometry/areasvols.htm
19. (Original post by SOREN_TORETTO)
I know its too late i got only 2 days how am I going to prepare

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Past Papers
20. (Original post by Columbo97)
These are all of them, only a few should come up.

http://math2.org/math/geometry/areasvols.htm
Thank you

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